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The image above represents a mountain and the crustal root beneath that mountain. What will happen to the base of the mountain’s crustal root as elevation increases due to crustal thickening?

A. The base of the crustal root will move down within the mantle

B. The base of the crustal root will move up within the mantle

C. The base of the crustal root will not change size or position

bold = correct answer

Question Identifier:
designed for: Non-science majors
primary author: M. Malone
modified by: E.M. Geraghty Ward, J. Libarkin
note: modified to focus on motion of the crustal root base